Picture frame



FIG. 1 is a right side elevational view of a picture frame showing my new design;

FIG. 2 is a front elevational view thereof, as seen in the direction of arrow 2 of FIG. 1;

FIG. 3 is a rear elevational view thereof, as seen in the direction of arrow 3 of FIG. 1;

FIG. 4 is a top plan view thereof, as seen in the direction of arrow 4 of FIG. 1; and,

FIG. 5 is a bottom plan view thereof, as seen in the direction of arrow 5 of FIG. 1. 

The ornamental design for a picture frame, substantially as shown and described. 